8.8

CVE-2026-98171

smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs

In the Linux kernel, the following vulnerability has been resolved:

smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs

Fix several related bounds checking and pointer lifecycle issues in
receive_encrypted_standard()'s handling of compound encrypted frames:

- Clear next_buffer after assigning it to server->bigbuf. A stale
  next_buffer pointer can lead to a use-after-free on subsequent
  error paths.
- Update pdu_length to the decrypted plaintext size (buf_size). Using
  the pre-decryption length allows NextCommand to point into stale
  ciphertext residue.
- Reject next_cmd values smaller than MID_HEADER_SIZE(server).
- Fix an integer overflow in the upper bound check by verifying
  pdu_length - next_cmd < MID_HEADER_SIZE(server), ensuring the
  trailing slice is large enough for a header.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
≫
Produkt Linux
Default Statusunaffected
Version b24df3e30cbf48255db866720fb71f14bf9d2f39
Version < 72eaef1f37a3b6bec11c342736834dc3707be3e4
Status affected
Version b24df3e30cbf48255db866720fb71f14bf9d2f39
Version < 491e33144dee872cffda207f6fcb09260728f803
Status affected
Version b24df3e30cbf48255db866720fb71f14bf9d2f39
Version < 8749946579708ea0d339034bb7f423a67dbe89cf
Status affected
Version b24df3e30cbf48255db866720fb71f14bf9d2f39
Version < 96c436e4b010711452b2872558938f4ef276492a
Status affected
Version b24df3e30cbf48255db866720fb71f14bf9d2f39
Version < 858d5ac22cb889266993e7670f9f0c4f4aeedd78
Status affected
Version b24df3e30cbf48255db866720fb71f14bf9d2f39
Version < 05762c5bc1cfdcac36747994fde2c04387a457f1
Status affected
HerstellerLinux
≫
Produkt Linux
Default Statusaffected
Version 4.19
Status affected
Version 0
Version < 4.19
Status unaffected
Version <= 6.1.*
Version 6.1.189
Status unaffected
Version <= 6.6.*
Version 6.6.158
Status unaffected
Version <= 6.12.*
Version 6.12.112
Status unaffected
Version <= 6.18.*
Version 6.18.54
Status unaffected
Version <= 7.2.*
Version 7.2.8
Status unaffected
Version <= *
Version 7.3-rc4
Status unaffected
VulnDex Vulnerability Enrichment
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.51% 0.413
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 8.8 2.8 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Es wurden noch keine Informationen zu CWE veröffentlicht.
https://git.kernel.org/stable/c/72eaef1f37a3b6bec11c342736834dc3707be3e4
https://git.kernel.org/stable/c/491e33144dee872cffda207f6fcb09260728f803
https://git.kernel.org/stable/c/8749946579708ea0d339034bb7f423a67dbe89cf
https://git.kernel.org/stable/c/96c436e4b010711452b2872558938f4ef276492a
https://git.kernel.org/stable/c/858d5ac22cb889266993e7670f9f0c4f4aeedd78
https://git.kernel.org/stable/c/05762c5bc1cfdcac36747994fde2c04387a457f1